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From "Nathan Mittler" <>
Subject Re: STOMP and JMSType
Date Tue, 13 Jun 2006 20:50:54 GMT
Could you guys point me to a place in AMQ where this sort of thing is being
done?  That would save me a lot of searching =)

I'm viewing this problem from the client side - the Stomp C++ client that
Tim Bish and I are writing currently supports text and bytes messages.  So
when I get a stomp frame in, I need to map it back to a text or bytes
message.  We chose to do this for a couple of reasons: 1) to give JMS users
a familiar interface and 2) to provide a simple interface for reading and
writing text messages (e.g. xml).

With that said, I'm not seeing how I can do that mapping if the transformer
is provided only in the SUBSCRIBE.  A client could potentially get a variety
of message types from a single subscription.  I think it would have to be
part of the MESSAGE frame, rather than the SUBSCRIBE.

Here are the use cases I see:

1) SEND\n...\ntransformer:text (client tells server it's a text message)
2) SEND\n...\ntransformer:bytes (client tells server it's a bytes message)
3) SEND\n...\ntransformer:default (client tells server to use content-length
to make determination)
4) SEND\n...\n (no transformer specified - same as #3)
5) SEND\n..\ntransformer:bob (client gives server unknown transformer - use

1) MESSAGE\n...\ntransformer:text (server tells client it's a text message)
2) MESSAGE\n...\ntransformer:bytes (server tells client it's a bytes
3) MESSAGE\n...\ntransformer:default (server tells client to use
content-length to make determination)
4) MESSAGE\n...\n (no transformer specified - same as #3)
5) MESSAGE\n...\ntransformer:bob (server tells client to use unknown
transformer - use default)

Does this make sense, or am I missing something?


On 6/13/06, Hiram Chirino <> wrote:
> > I would suggest that we use a weak form of specification encoding.
> > ActiveMQ already uses pseudo-urls in a lot of places, and named
> > transforms trump class names, usually:
> >
> yeah! URI style configuration rocks!
> > -Brian
> >
> >
> >
> >
> >
> --
> Regards,
> Hiram

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